APA (7th ed.) Citation

Clay, C. (2006). King, Kaiser, Tsar: Three royal cousins who led the world to war. John Murray.

Chicago Style (17th ed.) Citation

Clay, Catrine. King, Kaiser, Tsar: Three Royal Cousins Who Led the World to War. London: John Murray, 2006.

MLA (9th ed.) Citation

Clay, Catrine. King, Kaiser, Tsar: Three Royal Cousins Who Led the World to War. John Murray, 2006.